Effect of Dietary Energy and Protein Levels on Productivity and Feed Cost in Crossbred Chicks at Different Growth Stages
2011
Jeong, Y.D., Chonbuk National University, Jeonju, Republic of Korea | Youn, M.J., Chonbuk National University, Jeonju, Republic of Korea | Na, J.C., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Choi, H.C., National Institute of Animal Science, RDA, Cheonan, Republic of Korea | Ryu, K.S., Chonbuk National University, Jeonju, Republic of Korea
The study was conducted to investigate the effects of dietary energy and protein levels on productivity and feed cost in crossbred chicks. Experiment was divided into starting (0~5 weeks), growing (6~10 weeks), and finishing (11~14 weeks) periods. Design of feeding trials was 3 × 3 factorial to feed different energy and protein levels for starting (ME 2,950, 3,000, and 3,050 kcal/kg CP 18, 19, and 20%), growing (ME 3,000, 3,050, and 3,100 kcal/kg CP 17, 18, and 19%) and finishing (ME 3,050, 3,100, and 3,150 kcal/kg CP 16, 17, and 18%) periods, respectively. In the starting period, weight gain and FCR was improved by dietary protein level (P less than 0.05). Interaction effect existed in feed intake and FCR (P less than 0.05). Weight gain was higher in 3,000 kcal/kg ME treatment than 3,100 kcal/kg ME treatment for growing period (P less than 0.05). In finishing period, feed intake was significantly decreased in ME 3,150 kcal/kg treatment than the other ME treatments (P less than 0.05). Feed cost/weight gain (FC/WG) was significantly decreased in chicks fed with 2,950 kcal/kg ME and 19% CP in starting period (P less than 0.05). For the growing period, FC/WG was notably increased in ME 3,000, 3,050 kcal/kg treatment than ME 3,100 kcal/kg treatment, and the FC/WG of CP 17, 18% treatment was significantly higher than CP 16% treatment (P less than 0.05). Thus, the optimum levels of ME and CP to improve the productivity and feed cost for starting, growing and finishing periods were 2,950 kcal/kg ME, 19% CP 3,000 kcal/kg ME, 18% CP and 3,100 kcal/kg ME, 17 or 16% CP, respectively.
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